I have a few friends that don't run cats. If nothing, it is louder. One has straight pipes all the way back and is more annoying than anything.

 

has anyone used a magnaflow high flow cat converter and would they recomend it for some extra power while still staying legal?

 

Absolutely nothing.

"Back in the day" catalytic converters were made with pellets and often too small or restrictive... Removing the cat's improved the flow of the exhaust and resulted in improved performance. This day and age, the interior of a catalytic converter is a honeycomb, and while 50% of the interior is restricted, the catalytic converter itself is 200% in size compared to the exhaust pipe... So if you have 2+1/2" exhaust pipe, your catalytic converter will be about 5" in diameter, and even though 50% is restricted, you still have the exact same air flow through the cat as if it were a straight pipe. I have seen vehicles with these new catalytic converters with 100K miles on them, cut them open, they look brand new on the inside. Unless your truck has a serious problem with burning oil or sending un-burnt fuel into the exhaust, and then igniting... Removing the cat's on a new dodge is pointless and expensive.

 

I don't know if its just my experence, but the exhaust picks up some annoying resonance too when the cat is gutted or removed.